I don't think I need to give you further exposition after the recent interlude, so here's the overview, general rules and the armies to pick:

The Warlock is a non-playable character, as he's far too busy focusing all his magic into the Amplifier, charging it every turn. After Turn 10, if the ritual was unharmed throughout the battle, the Warlock shall unleash the amplified necrotic powers and summon a legion of undead soldiers, resulting in absolute evil victory.

The Imperial Army:

Shared Objective: Defeat the Dark Horde by force OR Allow Xalen to reach Ursa Hold and thwart the ritual.

As you could see, there are plentiful spots to take, so feel free to pick whatever you desire, the only requirement is that you're not planning leave the boards in the near future, because that would stall the game and would be generally unfun.

Bring me mead and bring me ale, To help us face this fight again! Good fortune will shine down on us, Together we will win!

And they will never break our spirit, We will never turn and run, And we will rise, stronger still When we stand as one!